xdg-desktop-portal works by exposing a series of D-Bus interfaces known as portals under a well-known name (org.freedesktop.portal.Desktop) and object path (/org/freedesktop/portal/desktop). The portal interfaces include APIs for file access, opening URIs, printing and others.
acquired package info from repodata DB: repodata/c2d29aa515e8b3edd7e8b792b8b297c63ffad1ea381e47edf7c5f57b95e0daba-primary.sqlite.bz2